Abstract
Present status of the development of microwave imaging diagnostics is presented. Electron cyclotron emission imaging (ECEI) is useful to obtain 2-D cross-sectional view of electron temperature. Microwave imaging reflectometer (MIR) is useful to obtain 2-D picture of electron density fluctuation. They will be powerful tool to study localized magnetohydrodynamic (MHD) instability and micro instability, which cause turbulence in plasma. Microwave imaging sensor is key technology, and several types of antenna array with Schottky barrier diodes have been developed. In order to reduce the size and cost, microwave circuits on board have been also developed. Microwave imaging diagnostics are now installed in LHD and TEXTOR. Comparison between the ECEI in TEXTOR to the rotational ECE imaging in TFTR shows advantages of ECEI.
